Common sense says that we don’t use our mobile phone when we cross the street. But why are people still doing it? Don’t they have this common sense of danger?
Why is there the need for MTR to make public announcement telling passengers not to look at their mobile phone when using the escalator? That is not the only “gentle reminder”. Others include beware slippers get caught when standing on escalator, loosen clothing when in compartment etc.
Obviously, what makes sense to some doesn’t mean so to others. Besides, what constitutes the “common”? A dozen, a hundred or more people? These people need to have the same history or same likes and dislikes to make up “a mass”. Then they might share the same “common sense”.
This can explain why parents and their children, employers and their staff, teachers and students cannot agree on their respective “common sense”. They have to make deliberate effort to understand the other party, accommodate differences and build ground for common sense to be nurtured.
So next time before we make a comment using “common sense” as the argument, we have to first establish if there is anything in “common” .